Variable-speed dynamic control for electric motors.



J. n. PIRMIN. VARIABLE SPEED DYNAMG CONTROL FOR ELECTRIC MOTORS. APPLICATION FILED `MAY 81, 1911.

STTES PAEN Spmncatiwx ci Letters Patent.

n has been lirartcu--m'ly de- 10 'voa'ged for 115e with nomtmw smh abs-:ence

my invention emjofed and wl/Lch i5 th@ best I have. up to the present time devised, con' .ses @kacc mad owl-L and decnbed in 523s; and Artm trol f( v filed Mm invent-ion truly automa@ x ith@ n; PC2115 um "l lse open 1e machin@ hsds'ng.

A, eud 01; mail) resistance R, variable in srmg The mmfhum compases arma" F, sem

50 armi. 4. Lnce R, zeC armature re Hmmm-5, im mvo armatme wsxsmfces;

Tn Handen mxime provided with @sommets many pa'xfs des" cclgsut wougl' dfefan L vovabe. commis of l), @ne im? nach pai @$6.3 ,'.de reims-'md psilon by Q0. In h@ gmmnmtic reprefief "a, J stmS of t csntms 17 E, 1U 11121,@ ,A t M'malar, :md muguet Coils 172 are pro'vlded for the conta@ especvehn An additional Gfmtac't point provides? adgficent t@ the main. resi @Midler handle :md when the movable @amulet ifa trcwn all the way point 53, tha. line circuif; is ihre -fuctor K to the ls; maga@ c 'tmugl th @they magnet midis Series, to Contact 5, tllrough the *and field mld bask go the neg-tiveline. Part of the Curran?, tends it@ t@ the armature cose cmu; AC :und f the @kunt ercu FS @rewind the. fiai l hat Circuit 330540.61 my me or umm Q comix: cts Y?, 18, 1Q. l Et ii ww be Simltxfgut FS iS a Cyl Lf; lhe anmunl of line eurrenl. When runningr un lhe liflh peint lhe line eurrenl all paflnes through llnl swileh manuels lT". ele. The arn'lal'ure, in luwerlng. having heen hrnughl ip 'Lu .Speed h v leriuluall)y vulling nul resi lanee l. the armature hurl eii'eult All? having' al lhe l anie linie heen prnperly ref fnlnlell h c inm'ing' lhe ennlael elf reaislanre ll lu l'he pninl r2, lhe nnwahle ennlael' nl' 1' 'i.'anee ll is linallr plarell 0n peint This ii lhe fulminer puinl liml all loadn in lowerne'. lf there is no leall en lh@ honk a heavy current new (lenlanfled 'from lhe line and lie magi et Swilrhes ll, 1SH lll are se adjusted lhat in (hin4 condition lhe heavy current causes then] all le close, enlling (uil all el the variable ree `fganee ll and allow ing only the. ixeel resistance ll'l lo renmin in lihe Shnnl.- rlreu- FS arnunrl lhe Held. relalivehgreat anieunt e? eurreni'J is thus Sluuilell arnunffI the lielll producing a weak lielll and4 allowing the meter le rotule rapidlyt lhus qnirlily and safely lowering lhe hnuli. n lhis ease the azanacure alle lakes eurrenl 'frein lhe line since it has to (l1-ire (lnwn the unleaden1 hoek and Overcome lirieliunal resieanelu ele.

Huppnsing new a lmul is pui en he hook, lhe vul-lg'hl nl the haul enlls le relate the armature anll no eurrenl required from lhe line le'n' l\;\.\'ering piu-poses except :for eX- eilali/.ul el" 'ghe lielll. 'The l'enflem'y Clif the :nlualuif la reinlre new generales a Cenner-ehrl 1.- :null-'e 'lm'a'e in lhe arlnainre Cir enil whlel: iellln'es lille :unuunll nl' current inl-I" i he l. e 'El e 1' 'ealel' (he lOud in lnnll 111. Ll l applied le liuhunk the grealer will he the if' unlee-ellrlm mulive l'erre generalefl and he line uri-ern wll he emresluuulingly rellnz'eal. llu rurreulA is rellueeu', the ell'ee nl lhe .-:\\,'ileh nxagnelsl is rellur'ml.

The npel'aiiun in running' in J(he lflh penn' will: llill'erenl leads; will new he speeilieallj,Y exylainml: llill. nu lnall nu the hunk lelie line eux-.ein ir-l very lieaYy :nul all lhe eenlaml` l?. lef, lll are eluaml hy the ae` limi nl lher magnets` eulxine' (au. all the variable reniaiazn'e aifuunl llu lielll anfl allowing; unire! l llul ruii'enl lo Hhnnl around lhe lielihfnlul-h is lhus nuule. very weak, permi'alinj; sale high sneefl of lhe inolnr for rapidly lmxf'rilng' ilu' unlnaflefl hunk, fl/hen a Very light luall phu'efl un (he heult lhe llne enrenl is iumlrraiely t'rflufel lo such an exli-nl' lli-il vill-heel, l arul lll are ele-sell but swilfeh l? remains ogn-n. A. :mall part of lha Jarialle resiulanre llana :ulllell lo the perlnanenl reiulam-e in lhe liehl shunt circuit; 'the llehl nl'renglh la somewhat inereasell anzl lh lmreringj speed nll the annature is redueerl. fx heavier lnaal will xatill further refliu'e lhrl line Current :unl swilehea l? and lll will remain open, hul'. rnvilelil1) will ele/'Sia The Variable, resislanre is lhns further inerranal and lhe field Strength is i llelails elM the ennlrnl er or pele changing :luifel Hua invention f nieehanisni are not a p azul need nel he llesrrll l rlaini: d l. Een eleelrie machine comprising an arnutrire, a field in series therewith, e. variable series resislanee7 a shunt eireut about the arnnilure, a Variable resislanee therein, a. shuntV circuit' about the Held', and automatic means-for varying the ulrengllh of the ield dependent' un lhe lnafl applied le the armature. Y

2. L ln an electric machine, tlleeilnbination of an armature, a Series elfl, a variable Series r' Slanee, a shunt circuit around the armature excluding the lielrl. a variable resistance in saill arn'iature Shunt circuit, a shunt eiieuly about the field7 a Variable resislauee for said field shunt circuit, and means eenlrnll-Plgl hy a eireuil in with lln` armature and lielll for varying said field resistan'ee ainl Consequently Varying lhe field nlrrngflli. i I

Il. ln an leelrie machine the combination of an armature, a field a lreuit in fhnnt ref lalinu lo l'he armature, a eirenit in shunt relation le the lielcl, a va "aille resistance in l'he latter, and aulmualie elee'lrle snilehes in lhe line eireuit for controlling Saul variable reSislanee.

'l. ln an eleclru: machine lhe Combination of an armature, a lelll in series with the arinalure, a elasel arnuil'ure eirruit, a circuit in Ashunt relation lo the field, a variable resist-ance therein` one er more switches to eenl'rol .Qaill reSiSrauee, magnet cells correa'jnndingf lo the swllehes, and a circuit in ,series with the line for Raid switch magnets, nlureh'v llilferenl relative loads applied t0 lhe armature'Cause the llelll slrength. to be ,"aried and the lmvering speed t0 be Conlrnllell.

5. lu a n eleelrie uxaehiue, the combination nlE an armature, a lielrl, a main resistance in series `willi the armature, an armature ein vuil', a resistance therein, a circuit in shunt relation le the ehl, :i variable resista-nce lherein, :nul auloinatie means for.' varying .saifl resisl'anee.

(l. ln an eleelrie maehine 'the combination of an armature, a lelcl, a main resistance in .wei-ies with the armalnze, an armature cirunit, a variable resielanee therein, a circuit xcieiion to the field, a variable relic und automatic' means for rsistance; f ..z; csi*ic machine, the combination man@ a cid; a Variable main re- 1 in' :seim with the field, an armature :LA variblc resistance therein, a cirit minion io the field, a Variable wf .mw Marcin, Switches for varying sid resistance, electric magnets for said switches, 10

circuits for said magnetsy in series witlithe armature and line, and a Contact for cnim'ola u ling said circuit.

Y JOHN D. FIRME? f' Witnessesz I WILLXAM LAUER, W. R. HUMMEL. 

